SR489-P1-LO-A20-E Low Control Power Protection Device

Description

489-P1-LO-A20 is a Multilin 489 generator management relay manufactured by GE Multilin. The generator relay has a 1 A phase CT secondary. The LO control power supply is 20-60 VDC and 20-48 VAC (48-62 Hz). The analog output of this relay is 4 to 20 mA. This relay has a basic display. The generator management relay does not have a protective conformal coating to prevent the impact of chemical environment. If you have any questions about this section, please contact AX Control.

The tripping protection functions of the relay include electrical locking analog inputs 1 to 4, thermal overload, RTD (stator, bearing, ambient temperature, others), low forward power, anti motor reverse power, loss of excitation reactive power (kvar), distance element (2 protection zones), loss of excitation (2 impedance coils), neutral undervoltage (3rd harmonic), neutral overvoltage (fundamental wave), overfrequency (two-step), underfrequency (two-step), high setting phase overcurrent Grounding direction, percentage difference, grounding overcurrent, negative sequence overcurrent, phase overcurrent with voltage limit, unintentional energization, offline overcurrent protection during startup, and seven assignable digital inputs.

The alarm protection functions of the relay include IRIG-B fault, service (self check fault), analog inputs 1 to 4, generator operating time, demand (current MW, Mvar, MVA), VT fuse fault, trip counter, thermal overload, RTD open circuit, RTD short circuit/low, RTD (stator, bearing, environment, others), low forward power, reverse power, reactive power (kvar), neutral undervoltage (third harmonic) Neutral overvoltage (fundamental), overvoltage, undervoltage frequency, volts/hertz, overvoltage, undervoltage, grounding direction, grounding overcurrent, negative sequence, overload, and 7 assignable digital inputs (universal input and tachometer).

The substation DCS system and unmanned duty are hot topics in the field of power grid dispatch automation today, and their development momentum is at its peak. There is a view abroad that people are easily influenced by various factors such as environment, emotions, personality, and diseases, making them unreliable factors. Indeed, many accidents are caused by human error. From multiple installation examples of DCS systems that have been put into operation, it can be seen that unmanned duty can effectively avoid the influence of human factors and improve operational reliability.

Substation automation has developed on the basis of computer technology and network communication technology. In the 1980s, decentralized substation automation systems were already introduced in foreign countries, while substation automation work in China started relatively late. Starting from the 1990s, the initial stage mainly focused on the development and production of centralized substation automation systems, such as DISA-1 [1], BJ-1 [2], iES-60, XWJK-1000A, FD-97, etc. In the mid-1990s, the development of decentralized substation automation systems began, such as DISA-2, DISA-3 [3,4], BJ-F3, CSC-2000 [5], DCAP3200, FDK, etc. There is a gap of about ten years compared to the advanced level abroad. Many universities, research institutions, manufacturers, as well as planning, design, infrastructure, and operation departments are learning and drawing on advanced foreign technologies, while working together to continue developing substation automation systems that are more in line with China’s actual situation. It can be expected that in the future, its development and promotion speed will become faster and the gap with foreign countries will gradually narrow.

In order to accelerate the development of substation automation technology in China and create greater benefits, it is necessary to discuss and explore the design principles, working modes, and development strategies of substation automation, in order to reach a consensus. In the future, the operation mode of substation automation will gradually transition from unmanned to manned to unmanned. Therefore, remote surveillance technology (such as fire prevention, theft prevention, stain prevention, waterproof vapor leakage, and remote monitoring) will emerge and rapidly develop. Cancel the traditional front-end processor link, thereby completely eliminating the communication “bottleneck” phenomenon and achieving a true automatic transmission development mode.